Plots to be made preliminary

We aim to present the following results.

• Cross-sections
• Lambda-Antilambda Asymmetry
• (Lambda+Antilambda)/K0s Ratio
• Lambda and Antilambda Transverse Polarization
• Lambda and Antilambda Longitudinal Polarization

The preliminary ZEUS plots are shown below in eps format. (For ease of viewing (but slightly lower quality) jpeg format plots are displayed at the bottom of the page)

• Polarization
• Polarization Values
• Cross-sections and ratios as a function of PT
• Cross-sections and ratios as a function of ETA
• Cross-sections and ratios as a function of Q2
• Cross-sections and ratios as a function of x

  We aim to make the values (or limits) for polarization preliminary too. We obtain the following values:

  		Polarization (%)	Statistical Error	Systematic Error
  Transverse	Lambda	1.4	4.5	+4.1, -2.0
  	Antilambda	-1.8	4.4	+3.1, -1.3
  Longitudinal	Lambda	-0.3	10.3	+0.1, -8.5
  	Antilambda	+19.8	10.8	+4.2, -13.6

  PS file with table of Polarization values
  Latex to generate table

  The following systematics are included in these plots:

  • Lambda Mass window: Use 1.107 - 1.125 GeV
  • K0s Mass window: Use 0.47 - 0.53 GeV
  • Electron Radius Cut (Box cut for low Q2): +/- 1cm
  • Yjb cut: +/- 0.0006
  • Track PT cut: +/- 0.03
  • Track Eta cut: +/- 0.1
  • Collinearity cut: +/- 0.05
  • |Zvtx| +/- 5cm
  • Electron Energy cut +/- 1 GeV
  • Mass cut to remove K0s from &Lambda +/- 0.03 GeV
  • Mass cut to remove &Lambda from K0s +/- 0.05 GeV
  • E-Pz cut +/- 2 GeV
  • Q2(el)
  • Decay Asymmetry Parameter Error (Polarization measurement only)